Redox Reactions · Balancing redox reactions

Consider the following redox reaction taking place in acidic medium

$\ce{BH4^-(aq) + ClO3^-(aq) -> H2BO3^-(aq) + Cl^-(aq)}$

If the Nernst equation for the above balanced reaction is $$E_\mathrm{cell} = E^\circ_\mathrm{cell} - \frac{RT}{nF}\ln Q,$$ Then the value of $n$ is . (Nearest integer)